(50% of the affiliates only had one sale... to themselves).
The key to successfully using affiliate programs for sales is to always test and refine (your creatives, ad copy, and landing pages).
Feel free to drop me a line if you want to chat in more detail.
Message me (AIM: ofchowdhury) and I can point you in the right direction.
Also, good banners are important.
Each network has a different reach & size. Shareasale is small and Linkshare is extra large while Commission Junction is right in the middle - but has the highest quality members (in my opinion).
All in all - Affiliate Programs are only as effective as you make them, I suggest you spend money on landing page optimization, retargeting & click tracking in conjunction with Affiliate Marketing.
For my own question. Any thoughts if I could make any money with affiliate marketing on this site: www.justoneclubcard.com
It only gets about 100 unique vistors per day but I figure it's pretty specific.